UPDATE:  I have NOT updated the C-130 to the new version yet. 

When I jump in it today, the autopilot turned on with the "Z" key and mapping to Autopilot On (one button) and Autopilot OFF (another key) .  Could not map the Alt hold, but the switch did work.  This was mapped to the TM Warthow throttle buttons.

I tried a quick Stream Deck Button to autopilot and shown above, but couldn't get it to work.   Didn't try too hard on it, so I have a ways to go on that.  I'd love to see the Stream Deck profile.

I want to point out again, I didn't do the CAPT Sim C-130 update yet.